As a damage element, high-speed fragments have significant effect on the ammunition safety. The impact from are also one of basic problems safety tests. To clarify reaction characteristics combustion, explosion, detonation, and so on, when hypersonic hit insensitive munitions, it is necessary to carry out corresponding research deceleration law fragment in air. In this paper, 30 mm caliber gun ...

This study aimed to compare two thermal modification (TM) schedules—with short and long heating phases—and their influence on the properties of maple (Acer pseudoplatanus L.) ash (Fraxinus excelsior wood. Two TM runs were conducted in industrial conditions (open system, steam atmosphere; substantially longer method compared processes usually described literature), with same peak phase (200 °C, ...

The actual task of this work is to obtain homogeneous hard alloys with fine carbide grains, combining high hardness and strength. Studies were carried out establish the most favorable phase compositions rational technical methodology for their production. In research work, a nanostructured WC-TiC-Co powder charge was obtained by mechanochemical synthesis. Nanosized WC nanopowder precipitated Co...

Abstract The combination of powder metallurgy and ball milling method has been widely regarded as the most beneficial route for producing multi-walled carbon nanotubes (MWCNTs)-reinforced aluminum matrix composites. In this study, effects different times (1, 2, 4, 8 h) on structural, morphological, crystallographic properties MWCNTs-reinforced Al7075 composite powders were characterized by part...

The presence of small amounts of boron in ductile iron is reported to have multiple and sometimes conflicting effects on the mechanical properties of ductile irons. The technical literature up until the early 1990’s states that small amounts of boron is a powerful carbide stabilizing element. Boron levels as low as 0.001% (10 ppm’s or parts per million) stabilize pearlite but larger amounts wer...

Non-linear quasi-static axisymmetric indentation problem is studied for comparitive computational analysis between elasto-plastic parameters and mechanical behaviour of homogeneous engineering metal materials. Mathematical model, based on deformation theory version of J2 theory, leads to quasi-static elasto-plastic contact problem with unknown contact domain, depending on the value of a indenta...